Fluke 753 Documenting Process Calibrator $ 6,199.99 The 753 does the work of several tools – sourcing, simulating and measuring pressure, temperature, and electrical signals in one rugged, hand-held calibration tool.. Fluke 740 Series Documenting Process Calibrators: Fluke 744: The first HART calibrator that is easy to use. HART Applications Versatile HART protocol support The 744 supports the commands contained in HART protocol version 5.7. With 2 MB of memory, the 744 communication to share the same two-wire. Thermocouple Wire and RTD Wire at Automation Direct. Your discount source for Thermcouple and RTD extension wire for industrial temperature sensing applications..